Z390 Phantom Gaming ITX/ac with i7-6700K£
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=18438
Printed Date: 27 Jul 2025 at 5:21pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z390 Phantom Gaming ITX/ac with i7-6700K£
Posted By: JohanVSF
Subject: Z390 Phantom Gaming ITX/ac with i7-6700K£
Date Posted: 23 Mar 2021 at 11:21pm
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I got myself this (used) motherboard along with a brand new i7-9700K. Unfortunately I can't even get it to POST. Fans and cooler do start but everything turns off after a short while, only to try to boot again and so on, again and again. A reasonable assumption would be that the CPU is the new R0-stepping and as such won't be recognized by the motherboard unless BIOS is at least v4.00. The sticker on the motherboard does say p4.00 though so I'm a bit puzzled. Maybe the former owner downgraded it at some point. What else could it be£ ( The build can be seen at https://pcpartpicker.com/list/D9qpLP ) . My second question is whether an i7-6700K would work (even if it isn't listed in the CPU supported lis). I need some other cpu to get it to boot so that I can update the BIOS (if that turns out to be necessary) and this is the only 1151-cpu I've been able to get hold of right now. In http://forum.asrock.com/forum_posts.asp£TID=16966&KW=6700&PID=80657&title=post-debug-code-18-on-asrock-z390-taichi-ultimate#top" rel="nofollow - this thread an ASRock official says that "Z390 platform mainly supports Coffee Lake CPU." and that "when 6700(Skylake) CPU is used, it will not work properly". Does this mean that it may work partially, although not perfectly, but at least sufficiently for me to be able to update the BIOS£ |
Replies:
Posted By: JohanVSF
Date Posted: 25 Mar 2021 at 6:09pm
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Recalled that I also swapped the Wifi-card too; from the stock Intel to a Broadcom. https://pcpartpicker.com/list/6Mwgy4" rel="nofollow - https://pcpartpicker.com/list/6Mwgy4 |
Posted By: Xaltar
Date Posted: 25 Mar 2021 at 6:24pm
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Afraid not, the 6700k is not supported. If memory serves there have been attempts to run Coffee Lake CPUs on older 200 and 100 series boards with mixed success but no one I know of has succeeded in getting Skylake to work on 300 series boards. Make sure you do a full CMOS clear: http://forum.asrock.com/forum_posts.asp£TID=630&title=how-to-clear-cmos-via-battery-removal" rel="nofollow - http://forum.asrock.com/forum_posts.asp£TID=630&title=how-to-clear-cmos-via-battery-removal It may be as simple as the board was used with a much different CPU and has retained some incompatible settings. The method I linked above should clear out anything left over from it's previous config completely. ------------- 
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Posted By: JohanVSF
Date Posted: 25 Mar 2021 at 9:24pm
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Thank you very much! I'll try that tonight. I actually saw that little piece of advice of yours elsewhere here yesterday and thought I'd give it a try. I'm a little confused about the 3rd step though "Place the "Clear CMOS" jumper in the clear position" I don't really understand what/where that would be on my motherboard. Or am I missing something here£! If maybe you could clarify that a bit, I'd be grateful!  (not my board, just to show...) And just FIY.. Seems to be something wonky with the link (The forum seems to like to replace question marks with Pound signs...  ) This worked though: forum.asrock.com/forum_posts.asp£TID=630 |
Posted By: JohanVSF
Date Posted: 25 Mar 2021 at 9:48pm
| hmm ... it replaced the question mark there too.. |
Posted By: Xaltar
Date Posted: 27 Mar 2021 at 8:26pm
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Sorry it took a while to get back to you, your post got bumped down below the recent post list. On your board you can just use the Clear CMOS button on the rear IO panel. Press and hold it down for 10 seconds or so (in place of using the jumper in the instructions I linked). -------------
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Posted By: JohanVSF
Date Posted: 27 Mar 2021 at 11:30pm
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Ok, just what I thought.. So shorting the two pins on the battery connector would essentially be exactly the same as pushing the button then£ In that case I've already done it..! :) I think I'll remove the CPU to see if there is any bent or broiken pins on the socket. Nothing else comes to mind right now. |
Posted By: Xaltar
Date Posted: 28 Mar 2021 at 3:09pm
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Actually, no, the battery connector pins have nothing to do with clearing CMOS. On most boards there is a separate set of jumpers for clearing CMOS. If you didn't use the momentary switch on the rear IO, give it a shot. Also, shorting the battery pins wouldn't have hurt anything incase you were concerned. -------------
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Posted By: JohanVSF
Date Posted: 29 Mar 2021 at 5:30pm
Ok, well I've already tried that, keeping the button pressed for at least a minute or so. I also removed the cooler and cpu to check for any damaged/bent pins but couldn't detect any.  I think I'll take everything apart tonight and start from scratch but first I'll try with some other memories I had the chance to borrow. |
Xaltar wrote:Posted By: JohanVSF
Date Posted: 02 Apr 2021 at 1:52am
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Now I've disassembled the build and then I tested again with a bare bone setup (outside the chassi). Only CPU/Cooler/1 RAM/PSU. I even disconnected the wifi-module as I have replaced the wifi card inside it. The scenario stays the same though. No boot and shutdown after ca 20 seconds. Should I be worried about the sort of brownish contacts on the motherboard socket£ Is it possible that something' burnt there£ 
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Posted By: JohanVSF
Date Posted: 07 Apr 2021 at 4:03pm
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Problems solved.. Problemet löst..! :) CPU-cable wasn't properly inserted in the PSU :) ££££ Now, running v4.00 in BIOS; is it worth updating it to latest v4.40£ Or does "better safe than sorry" apply here.. :) £ |